-2.1=-9.1+10.9y-8.7y

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Solution for -2.1=-9.1+10.9y-8.7y equation: 


Simplifying
-2.1 = -9.1 + 10.9y + -8.7y

Combine like terms: 10.9y + -8.7y = 2.2y
-2.1 = -9.1 + 2.2y

Solving
-2.1 = -9.1 + 2.2y

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-2.2y' to each side of the equation.
-2.1 + -2.2y = -9.1 + 2.2y + -2.2y

Combine like terms: 2.2y + -2.2y = 0.0
-2.1 + -2.2y = -9.1 + 0.0
-2.1 + -2.2y = -9.1

Add '2.1' to each side of the equation.
-2.1 + 2.1 + -2.2y = -9.1 + 2.1

Combine like terms: -2.1 + 2.1 = 0.0
0.0 + -2.2y = -9.1 + 2.1
-2.2y = -9.1 + 2.1

Combine like terms: -9.1 + 2.1 = -7
-2.2y = -7

Divide each side by '-2.2'.
y = 3.181818182

Simplifying
y = 3.181818182

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